Electric-arc lamp.



No. 65|,498. Patented lune l2, I900.

E. BDNHIVERS. ELEcfmc Anc LAMP.

(Application riled Jan. 2, 1900, (No Model.) 2 Sheets--Sheei l.

m: NORRIS Pans cof; Pam's-1.1mm. WASHINGTON. o c.

Q No. 65,498.

(No Model.)

Patented lune l2, I900.

E. BUNHIVERS.

ELECTRIC ARC LAMP.

(Application filed Jan. 2, 1900.)

2 Sheets$heet 2.

UNITED STATES .ATENT Prion.

EMILE BONI-IIVERS, OF LEVALLOIS-PERRET, FRANCE.

ELECTRIC-ARC LAMP.

SJPEGIFICATION forming part of Letters Patent No. 651,498, dated June 12, 1900. Application filed January 2, 1900. Serial No. 132- (No model.)

1'0 ctZZ whom it may concern.-

Be it known that I, EMILE BONHIVERS, of the city of Levallois-Perret, in the Republic of France, have invented new and useful Improvements in Incandescent Lighting, which are fully set forth in the following specification.

This invention relates to a new refractory composition intended for the manufacture of mantles or disks applicable to electricarc lamps, incandescent gas-lamps, and petroleum or alcohol incandescent lamps for the purpose of increasing their illuminating power. The substance of which the block or disk is formed is absolutely incombustible and is rendered incandescent without deterioration at the high temperature of the arc; In the accompanying drawings this new block or disk is represented in combination with an ordinary arc-lam p.

Figure 1 is an elevation of such a lamp, the carbons of which are in vertical alinement. The block is shown in vertical section. Fig. 2 is a side view of the same lamp and a front view of the block. Fig. 3 is an elevation of the same lamp in which the block is horizontally situated, the upper and positive carbon passing downwardly through an opening provided in the center of said block. Fig. 4 is a front view of the block as it is shown in Figs. 1 and 2. Fig. 5 is a side View showing the supporting-ring and its connections with the lamp-frame. Fig. 6 is an elevation of the block as it is shown in Fig. 3.

As may be seen, this new block or disk 0 has the form of a piano-concave lens. As represented in Figs. 1, 2, 4, and 5, this block is provided at two diametrically-opposite points with two notches p '19, through which pass the carbons h it without touching the block, the are being set up on the axis of the lens.

The refractory block is held by a supporting ring or collar 1), locked'up by means of a thumb-screw (:1, this ring being attached to the lamp-frame by means of arms g g. .This supporting-ring Z) may hold the block either horizontally or laterally or more or less inclined.

The block shown in Figs. 3 and 6 is provided, instead of the two notches, with a central opening 1', through which the upper and positive carbon passes downwardly without touching the block, the are being thus set up just below the concave and under face of the block, which forms a reflector.

I prepare the improved composition of which the block is formed in the following manner: I intimately mix the following substances: twenty-five parts of raw clay, fifty parts of baked clay, twenty parts of pulverized quartz, and five parts of boric acid. I mix these four substances in a thoroughly-intimate and homogeneous manner, and I submit them after being molded to a prolonged baking. The temperature in the furnace must reach 1,500 to 2,000 centigrade. After forty-eight hours I take the mold out of the furnace and throw both the mold and the compound or composition it contains into a concentrated solution of boric acid. After this I take the block now formed out of the mold, let it dry, and thus obtain a refractory block of a plano-concave shape ready for use.

In an electric-arc lamp provided with such a block the light it gives out is not only increased, but also its steadiness.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- 1. In an illuminating device, a refractory block or mantle adapted to be rendered incandescent for producing illumination, consisting of a mixture of raw and baked clay, pulverized quartz and boric acid.

2. The combination with a lamp, of a refractory block or mantle, consisting of a com position of pulverized quartz, raw and baked clay, and boric acid, said block having the form of a plano-concave lens and being rendered incandescent by the flame of the lamp and thereby increasing the illuminating power of the latter.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

EMILE BONI-IIVER SL Witnesses FERNANDO DE LE OALLE, EDWARD P. MAOLEAN. 

